[cdbov]

Hi,
I have written a UDF for defining the granular viscosity of the secondary phase of a multiphase fluid:

#include "udf.h"

#define PI 3.14159265
#define vof_smax 0.65
#define vof_sfric 0.5
#define ess 0.9
#define d_s 0.024353175


DEFINE_PROPERTY(granular_viscosity,c,t)
{
real collisonal_visc, kinetic_visc, frictional_visc, bulk_visc, granular_visc;
real g0, I2d, Idd, P_s, P_fric, nablavel_s;
real temp_s, vof_s, visc_g, rho_s, dudx, dvdy, dwdz, repose_angle;

Domain *domain;
domain=Get_Domain(3);

temp_s = C_T(c,t);
vof_s = C_VOF(c,t);
visc_g = C_MU_EFF(c,t);
rho_s = C_R(c,t);
dudx = C_DUDX(c,t);
dvdy = C_DVDY(c,t);
dwdz = C_DWDZ(c,t);
repose_angle = 30;

nablavel_s = dudx+dvdy+dwdz;
g0 = pow((1-(vof_s/vof_smax)),(-2.5*vof_smax));
kinetic_visc = (sqrt(PI*temp_s)*(d_s*rho_s/(24*vof_s*g0))*(((5+2*vof_s*g0*(1+ess)*(3*ess-1)))/((1+ess)*(3-ess))))/((1+(45*visc_g/(6*vof_s*g0*d_s*rho_s*sqrt(temp_s/PI)*(1+ess)*(3*ess-1)))));
collisonal_visc = 4/5*vof_s*rho_s*g0*(1+ess)*(kinetic_visc/rho_s+d_s*sqrt(temp_s/PI));
granular_visc = kinetic_visc+collisonal_visc;

return granular_visc;
}




I compiled and loaded it with Fluent 15 but when I try to run a simulation I have an error:

Node 0: Process 1856: Received signal SIGSEGV.

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Node 1: Process 2552: Received signal SIGSEGV.

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MPI Application rank 0 exited before MPI_Finalize() with status 2
The fl process could not be started.

If I debug it, at the watch window appears the following error:
CXX0017: Error: symbol "C_T" not found.

I am a beginner in writting UDFs and I don´t know if this problem is because of the code or a problem with Fluent because it seems that it doesn´t recognize the Macros for Cell Flow Variables, like the one for temperature.

If someone could give me any advice it would be very nice.
Thanks in advance

[HyperNova]

Hi ,
Could u solve your problem ? i encounter it (( i installed MPI but didn't work
in one forum i read this is beacuse of a bug in fluent 15.0 but i don't know how to solve , any idea will be appreciated , thanks

this is what happens :

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Node 0: Process 5080: Received signal SIGSEGV.

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Node 1: Process 1908: Received signal SIGSEGV.

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Node 2: Process 1372: Received signal SIGSEGV.

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Node 3: Process 3584: Received signal SIGSEGV.

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MPI Application rank 0 exited before MPI_Finalize() with status 2
The fl process could not be started.

[Harry321]

Try to run your calculation in serial mode, it is much easier to find where the problem is. If it runs, it means there is a problem with parallelization.

[HyperNova]

Originally Posted by Harry321

Try to run your calculation in serial mode, it is much easier to find where the problem is. If it runs, it means there is a problem with parallelization.

thanks dude, i solved it months ago thanks a lot

[fishball]

Originally Posted by HyperNova

thanks dude, i solved it months ago thanks a lot

Hi HyperNova,

Could you tell the solution? because i have got the same problem.. Cheers

fishball